Tailoring mixed-valence Co-III/Fe-II complexes for their potential use as sensitizers in dye sensitized solar cells

Bernhardt, Paul V., Boschloo, Gerrit K., Bozoglian, Fernando, Hagfeldt, Anders, Martinez, Manuel and Sienrad, Beatriz (2008) Tailoring mixed-valence Co-III/Fe-II complexes for their potential use as sensitizers in dye sensitized solar cells. New Journal of Chemistry, 32 4: 705-711. doi:10.1039/b716855a


Author Bernhardt, Paul V.
Boschloo, Gerrit K.
Bozoglian, Fernando
Hagfeldt, Anders
Martinez, Manuel
Sienrad, Beatriz
Title Tailoring mixed-valence Co-III/Fe-II complexes for their potential use as sensitizers in dye sensitized solar cells
Formatted title
Tailoring mixed-valence CoIII /FeII complexes for their potential use as sensitizers in dye sensitized solar cells
Journal name New Journal of Chemistry   Check publisher's open access policy
ISSN 1144-0546
Publication date 2008-01-01
Sub-type Article (original research)
DOI 10.1039/b716855a
Open Access Status Not Open Access
Volume 32
Issue 4
Start page 705
End page 711
Total pages 7
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Formatted abstract
Dinuclear class II CoIII/FeII mixed-valence complexes of type [LnCoIII(µ-NC)FeII(CN)3L2]m- (where Ln represents a pentadentate macrocycle and L2 a bpy ligand or two cyanides) have electronic properties that make them possible sensitizers in DSSC (dye sensitized solar cells). For this purpose the new complex Na2[{trans-L14COOCoIII(µ-NC)}FeII(CN)5] has been prepared and characterized by the usual methods and its sensitizer properties compared with those of the already known [{trans-L15CoIII(µ-NC)}FeII(CN)3(bipy)eq,ax](ClO4). The complex [{trans-L14COOCoIII(µ-NC)}FeII(CN)5]2- has been designed for the actuation of an electron injection from the cobalt centre on MMCT, while the [{trans-LnCoIII(µ-NC)}FeII(CN)3(bipy)]+ structure can produce a tuned injection from the iron centre via an MLCT electronic state, as described for similar systems. The characterization on solid oxide semiconductor supports has been carried out for these two complexes and the results have been compared with the behaviour observed in aqueous solution and in solvents of varying polarities. Their use in DSSC has been checked and, while a sensitizer response is observed for [{trans-L14COOCoIII(µ-NC)}FeII(CN)5]2-, complex [{trans-L15CoIII(µ-NC)}FeII(CN)3(bipy)eq,ax]+ does not produce any electrical current on illumination. The low efficiency of the built DSSC can be easily related both with the very low value of the extinction coefficient of the MMCT band responsible for the electron injection, and with the small driving force for the reduction of the complex with the standard I2/I3- system used after electron injection.
Keyword Amino-Substituted Tetraazacycloalkanes
Charge-Transfer Sensitizers
Quinquedentate
Coordination
Cobalt(iii) Complexes
Crystal-structures
Electron-transfer
Base-Hydrolysis
Metal-complexes
Excited-state
Films
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Chemistry and Molecular Biosciences
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 19 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 21 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Fri, 27 Mar 2009, 20:26:42 EST by Glenda Chown on behalf of School of Chemistry & Molecular Biosciences